#!/usr/bin/env python3
# Copyright (c) 2021, NVIDIA CORPORATION.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

'''cuML RF to Treelite checkpoint converter

Given a path to a pickle file containing a cuML random forest model, this
script will generate a Treelite checkpoint file representation of the model in
the same directory.
'''

import argparse
import os
import pickle

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument(
        'pickle_file', help='Path to the pickle file to convert'
    )
    args = parser.parse_args()

    with open(args.pickle_file, 'rb') as file_:
        model = pickle.load(file_)

    model_dir = os.path.dirname(args.pickle_file)
    out_path = os.path.join(model_dir, 'checkpoint.tl')

    model.convert_to_treelite_model().to_treelite_checkpoint(out_path)
